UObjectLibrary Undefined

I am trying to use an ObjectLibrary to load assets, as mentioned here, but I can’t figure out what includes I need to get UObjectLibrary to be recognized by my compiler. Can anyone point me in the right direction?

#include “Engine/ObjectLibrary.h”

Shame that this is not defined in the UE4 documentation. Forces us to have to look into the source code to see what I need include to use some class.